docs: def create_azure_storage_credentials(config, general_options):
      # type: (dict, blobxfer.models.options.General) ->
      #        blobxfer.operations.azure.StorageCredentials
      """Create an Azure StorageCredentials object from configuration
      :param dict config: config dict
      :param blobxfer.models.options.General: general options
      :rtype: blobxfer.operations.azure.StorageCredentials
      :return: credentials object
      """
      creds = blobxfer.operations.azure.StorageCredentials(general_options)
      endpoint = config['azure_storage'].get('endpoint') or 'core.windows.net'
      for name in config['azure_storage']['accounts']:
          key = config['azure_storage']['accounts'][name]
          creds.add_storage_account(name, key, endpoint)
      return creds